linux-kernel - Re: [RFC 4/5] sbm: fix up calls to dynamic memory allocators

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Date: Thu, 22 Feb 2024 10:03:03 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Petr Tesařík <petr@...arici.cz>
Cc: Petr Tesarik <petrtesarik@...weicloud.com>,
 Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
 "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>,
 Oleg Nesterov <oleg@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Xin Li <xin3.li@...el.com>, Arnd Bergmann <arnd@...db.de>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Rick Edgecombe <rick.p.edgecombe@...el.com>,
 Kees Cook <keescook@...omium.org>,
 "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
 Pengfei Xu <pengfei.xu@...el.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Ze Gao <zegao2021@...il.com>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 Kai Huang <kai.huang@...el.com>, David Woodhouse <dwmw@...zon.co.uk>,
 Brian Gerst <brgerst@...il.com>, Jason Gunthorpe <jgg@...pe.ca>,
 Joerg Roedel <jroedel@...e.de>, "Mike Rapoport (IBM)" <rppt@...nel.org>,
 Tina Zhang <tina.zhang@...el.com>, Jacob Pan
 <jacob.jun.pan@...ux.intel.com>,
 "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>,
 Roberto Sassu <roberto.sassu@...weicloud.com>,
 John Johansen <john.johansen@...onical.com>, Paul Moore
 <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
 "Serge E. Hallyn" <serge@...lyn.com>, apparmor@...ts.ubuntu.com,
 linux-security-module@...r.kernel.org,
 Petr Tesarik <petr.tesarik1@...wei-partners.com>
Subject: Re: [RFC 4/5] sbm: fix up calls to dynamic memory allocators

On 2/22/24 09:57, Petr Tesařík wrote:
> * Hardware designers are adding (other) hardware security defenses to
>   ring-0 that are not applied to ring-3.
> 
>   Could you give an example of these other security defenses, please?

Here's one example:

> https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/data-dependent-prefetcher.html

"DDP is neither trained by nor triggered by supervisor-mode accesses."

But seriously, this is going to be my last message on this topic.  I
appreciate your enthusiasm, but I don't see any viable way forward for
this approach.